316 



DR R. E. SCORESBY-JACKSON 



The t-wo last tables, I think, point to this, that for three quarters of the year 

 the relationship of monthly range of temperature and the death-rate from all 

 causes is inverse — the greater the range the lower the mortality ; but that during 

 the months of July, August, and September, the relationship is direct — the greater 

 the range the greater the mortality. 



Mean Daily Range of Temperature. — The relationship as shown in Table A. is 

 as follows : — 



Section. Mortality. 



Maximum, 269-49 



Major, 233-25 



Minor, 214-26 



Minimum, 185-85 



Means, . . . 225-71 



Mean of the. 

 Daily Eanges. 



9-8 

 11-6 

 130 

 13-8 



120 



The result of constructing two excessive years out of the six is as follows : — 





January. 



February. 



March. 



April. 



May. 



June. 



Months of greatest Mean Daily Range, 

 Months of least „ „ 

 Means of the Six Years, . . 



o 



9-6 

 7-1 

 8-4 



243-4 

 296-6 

 265-3 



10°8 



8-6 



10-0 



250-1 

 251-3 

 257-4 



o 



11-9 

 9-3 



10-7 



257-8 

 256-7 

 249-8 



15-3 

 12-0 

 139 



227-1 

 243-6 

 242-8 



19-7 

 14-1 

 15-6 



193-5 

 228-4 

 219-5 



17-2 

 12-6 

 14-9 



213-3 

 215-0 



208-6 





July. 



August. 



September. 



October. 



November. 



December. 



Months of greatest Mean Daily Range, 

 Months of least ,, ,, 

 Means of the Six Years, . . 



14-7 

 13-1 

 14-0 



224-0 

 192-3 

 204-5 



16-0 

 11-0 

 13-5 



199-5 

 173-1 

 189-4 



14-6 

 11-0 

 13-3 



194-6 

 165-0 

 187-7 



12°7 

 10-9 

 11-8 



204-4 

 210-4 

 198-2 



11-0 

 8-1 

 99 



234-7 

 230-0 

 237-1 



9-5 

 8-1 

 8-6 



241-4 

 257-7 

 247-9 



These tables indicate a similar relationship between mortality from all causes 

 and the mean daily range of temperature as was noticed with respect to the 

 monthly range of temperature, namely for three quarters of the years an inverse 

 relationship, the greater the daily range the less the death-rate, but during the 

 months of July, August, and September, a direct relationship, the greater the 

 daily range of temperature the greater the mortality. It will be noticed in the 

 latter table that March and November do not quite conform. 



The Combined Influence of Temperature and Humidity. 



It is difficult to obtain data for this inquiry, there being few months which, 

 with equal mean temperatures, show at the same time a marked contrast in their 

 hygrometric condition. I have, however, endeavoured in the following table to 

 show the relative effect upon the death-rate of a dry and humid cold: — 



